Blowpipe gas-flow control



Patented Mar. 6, 192s.

UNITED STATES 1,661,691 PATENT oFFlcE.

ANDREW J. EASON, OF SAN BERNARDINO, CALIFORNIA, ASSIGNOR OF ONE-HALF TULAH J. W. WEST, OF SAN BERNARDINO, CALIFORNIA.

BLOWPIPE GAS-FLOW CONTROL.

Application tiled Hay 22,

This invention relates to improvements in blow pipes or torches, such asare commonly used in acetylene welding an` heating.

In the conventional forms of prior constructions there are two conduitswhich lead fromsources of gas supply to the blow pipe and serve toconvey a fuel and oxygen to the blow pipe. Usually, these conduits areprovided with valves which are in the form of needle valves andwhichhave line threads permitting a fine adjustment of the quantities of gasflowing through their respective conduits. Because of the tine threadsemployed considerable time is'required to completely shut off thesevalves and to open them. Consequently, when there is a back fire or whenthe workman should desire to shut off his torch or blow pipe for a shorttime, considerable time is required to turn oi both of the valves,causing not only a waste of time, but also a waste of gases Howing throuh the conduits. Onagain opening the va ves a similar amount of time'andgases is wasted before the correct adJustment is obtained.

An object of this invention is to provide an improved blow pipe, whereinthere are uickly movable valves in each of the conuits which areassociated with the valves conventionally employed, enabling the workmanto quickly close or open the conduits without operating the adjustingvalves conventionally employed, thus enabling the workman tok open andclose the conduits uickly, leaving the conventional valves stationary intheir adjusted position.

Another object of this invention is to provide a construction wherebythe quick-throw valves can be operated simultaneously by a single memberto open and close their respective conduits.

With the foregoing and other objects 1n view which will be made manifestin the following detailed description and specifically pointed out inthe appended claims,

reference is had to the accompanying drawings for an illustrativeembodiment of the invention, wherein:

Figure 1 is a side elevation of a blow -pipe embodying the invention,

Fig. 2 is an end elevation of the same taken in the direction of thearrow 2 upon Fig. 1,

Fig. 3 is a partial side elevation taken 1n the direction of the arrow 3upon Fig. 1,

1926. Serial No. 110,849.

Fig. 4 is a sectional viewl taken on the line 4-4 of Fig. 1, and

Fig. 5 is a sectional view through the connecting lilik illustrating itsdetails of construction. y

Referring to the accompanying drawings wherein similar referencecharacters designate similar parts throughout, the body of the improvedblow pipe is indicated at4 1() and is provided with a tip 11. Twoconduits 12 and 13 lead to the body of the blow pipe and in each ofthese conduits there are the conventional needle valves, indicatedrespectively at 14 and 15. These needle valves are threaded with finethreads indicated at 16 upon Fig. 4, permitting a fine adjustment, butat the same time being disadvantageous in that considerable time isrequired to completely close these valves or to open them. The inventionconsists of providing in the conduits seats 17 for valve closures 18which are urged into seating position by coil springs '19. The coilsprings 19 are compressed between flanges 20 on the valve closures whichhave grooves on their peripheral surfaces and between the bodies 21 ofcouplings, serving to connect the blow pipe to hose leading from sourcesof gas supply. The valve closures 18 have stems 22 which are slidable inthe bodies 21 of the couplings.

Upon the conduits there are formed internally threaded nipples 23 whichreceive stuffing boxes 24. Valve stems 25 extend through the stutlingboxes and atight joint is maintained about them by means of packing nuts26 which compress packing in the stuffing boxes about the stems 25. Thelower end of each stem is provided with a cam 27 which is engageableupon the lange 2() of each valve closure 18, so that upon rotation ofthe stem 25, the valve closure 18 associated with it may be moved intoseating position or be unseated. The top of each stem 125 has mountedthereon a slotted arm 28, and a link 29 pivotally connected to alever'() which is pivoted on the body of the blow pipe has a pin 31extending throughthe slots of both of the arms 28. The link 29 is formedof two pieces 32 and 33. The piece 32 has a groove formed in it which is'los 4dove-tailed in cross section and the piece 33 slida'bly ts withinthis groove. The piece 33 a so has a slot throughwhich the screw 34extends. This construction pro- 110 vides for `an i. adjustment `of thelink 29 as to its length.

The operation of the improved blow pipe is as follows: In using the blow.pipe the valves 14 and 15 are adjusted to permit the conduits to conveythe proper amount of ases to the tip 11. In the event of a back igire orin the event that the workman should wish to lay down his blow pipe fora short time, it is `merely necessary to swing the top of the lever 30forwardly. This swings the link 29 backwardly and causes both valvestems to rotate, thus rotating the cams 27 and ermitting the valveclosures 18 to be seated by thesprings 19, e'ectively cutting off theflow of gases through the conduits. When the workman wishes to resumework, he merelyqswings the upper end of the lever backwardly, causingboth of the closures 18 to beunseated and lpermitting the gases to 'Howthrough, the conduits as before, By this arrangement it will beappreciated that it is not necessary to touch the valves 14 or 15,

' fp; and that these valves can be allowed to re- `main in theiradjusted positions. In view of the fact that the valve closures 18 arequickly operable, a considerable amount of time and gases are saved,which would otherwise be consumed on completely closing and openinfrboth of the valves 14 and 15.

If desired, the improved construction may be made in the. form of anattachment, in which the conduit in which the valve closures 18 aredisposed is inthe form of a barrel adapted to be attached to the blowpipe by means of a coupling 35, which has both right and left handthreads, permitting the barrel to be firmly secured to the blow pipe.

From the above described construction it will be appreciated that anovel and eficient blow pipe is used which is designed to overcome manydisadvantages which occur in using the conventional blow ipe.

It is to be noted that a characteristic feature of m invention isthatyboth of the valves inte conduits 12 and 13 are simultaneously controlledand ma be ositively opened or ositively close wit out the necessity ofliolding the lever 30, therefore, when these valves are open theoperator may release his hand from engagin the said lever 30 and mayclas the work eing operated on and thewor man may engage the blow pipenearer the tip in order to guide same more accurately in the workundertaken. My invention distinguishes :from other devices in which itis necessary for the operatorl to continuously hold the valvemechanismto retain it in the desired position..

It will be understood that various changes ma be made in lthe detail ofconstruction wit out, departing from the spirit or scope of theinvention as defined by the appended y;

claims.

I claim: v

1. A blow pipe having two gas conduits, valves mounted in the conduits,each of ythe valves having a rotatable stem on which there is a slottedarm, a lever pivoted upon the blow pipe,'andalinkpivoted to thelever andhaving a pin extending through the slots in both of said arms, wherebyupon moving the lever both of said valves may be simultaneously openedor closed.

2. A blow pipe having two gas conduits, valves mounted in the conduits,each of the valves having a rotatable stem on which there is a slottedarm, a lever pivoted upony the blow pipe, and a link pivoted to thelever and avinga pin extending through the slots in both of said arms,whereby upon moving the lever both of said valves may besimultaneouslyopened or closed, said link being adjustable.

, In testimony whereof I have signed my name to this specification.

ANDREW J. EASON.

